Elevated auxin biosynthesis and transport underlie high vein density in C₄ leaves.

ABSTRACT: High vein density, a distinctive trait of C₄ leaves, is central to both C₃-to-C₄ evolution and conversion of C₃ to C₄-like crops. We tested the hypothesis that high vein density in C₄ leaves is due to elevated auxin biosynthesis and transport in developing leaves. Up-regulation of genes in auxin biosynthesis pathways and higher auxin content were found in developing C₄ leaves compared with developing C₃ leaves. The same observation held for maize foliar (C₄) and husk (C₃) leaf primordia. Moreover, auxin content and vein density were increased in loss-of-function mutants of Arabidopsis MYC2, a suppressor of auxin biosynthesis. Treatment with an auxin biosynthesis inhibitor or

SUBMITTER: Huang CF 

PROVIDER: S-EPMC5565467 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature